Coupling between light- and food-entrainable circadian oscillators in pigeons
Coupling between light- and food-entrainable circadian oscillators in pigeons
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DOI：
10.1016/0031-9384(95)02125-6
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发表时间：
1996-04-01
影响因子：
2.9
通讯作者：
Stephan, FK
中科院分区：
文献类型：
--
作者：
Rashotte, ME;Stephan, FK
为了确定鸽子是否有单独的食物可携振子（FEO），并评估FEO和光可携振子（LEG）之间的耦合强度，进行了两个限制饲喂计划的实验。在基线条件下，两只鸽子的体温（T-b）和O-2消耗在光照开始（LD 12:12周期）和食物呈现（光照阶段第9小时）之前增加。在一项实验中，在喂食时间不变的情况下，LD周期延迟或提前4 h时，T-b和O-2在起光前的上升出现了预期的延迟或提前瞬态，但在喂食前的上升也延迟或提前了数天才恢复到适当的相位位置。在第二个实验中，每隔23.5 h给予食物，连续10天，而LD周期以24小时为周期。LD循环的摄取量不受影响，在改变饲喂时间之前，T-b和O-2的摄取量继续上升，但提前期缩短。当饲喂时间随后延迟5 h时，T-b和O-2的消耗与LD周期无关，但延迟瞬变发生，直到两种测量值重新回到新的饲喂时间。研究结果支持了鸽子独立FEO的存在，表明LEO和FEO之间存在不对称耦合，前者对后者的影响更大。
Two experiments were conducted with a restricted feeding schedule to determine whether pigeons have a separate food-entrainable oscillator (FEO) and to assess the coupling strength between the FEO and the light-entrainable oscillator (LEG). In the baseline condition, the body temperature (T-b) and O-2 consumption of two pigeons increased prior to light onset (LD 12:12 cycle) and food presentation (at the ninth hour of the light phase). In one experiment, when the LD cycle was phase delayed or advanced by 4 h while feeding time remained unchanged, the T-b and O-2 rises prior to light-onset showed the expected delaying or advancing transients, but the rises prior to feeding also delayed or advanced for several days before returning to their proper phase position. In the second experiment, food was presented at 23.5-h intervals for 10 days while the LD cycle continued with a 24-h period. Entrainment to the LD cycle was unaffected, and T-b and O-2 consumption continued to rise prior to the changing feeding time, but with a reduced lead time. When the feeding time was subsequently delayed by 5 h, T-b and O-2 consumption with regard to the LD cycle were unaffected, but delaying transients occurred until both measures reentrained to the new feeding time. The results provide support for the existence of a separate FEO in pigeons and indicate asymmetrical coupling between the LEO and FEO, with the former having a stronger effect on the latter.